Hihon: sode to sode (1974)

Starts with this one dude—Asian, mid-30s, lean with arm tats—inking up a skinny Asian chick’s back. She’s face down on a table, long dark hair loose, back already covered in small designs. Feels like a real tattoo session, not just some quick prop. Then the scene flips: two girls in kimonos, one with her hair in buns, the other with it tied back, sitting in a tiny boat on a lake. No sex yet, just setting up the vibe. Later, the same girls are in a traditional room, sliding doors and tatami mats, doing some light teasing and grinding. The camera keeps it tight on their faces and hands, so you see every little touch. No crazy positions, but the slow build and the ink detail make it stand out.